The court heard that the pair had also plotted to kill her four other children and the judge today said they may ‘spend their whole lives in jail’.
According to the charges, the the conspiracy to murder the six children took place between May 14 and May 20. The murders then took place on the morning of May 24, and police were called to the property shortly after.
Police were called to their semi-detached house in the Shiregreen area in May after they were said to have fallen ill and took the boys to hospital where they were later pronounced dead.
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Sarah Barrass, [left], and her brother Brandon Machin, [right] have been accused of murdering the two teenagers.  Barrass and Machin plead guilty to murder and conspiracy. Sentencing is set to take place on Nov 12  

The brothers died in hospital 12 minutes apart. No details have yet been given as to what happened to the children inside the property.
This is while an inquest was opened and adjourned in July, but no suspected cause of death was given at the time.
Today Barrass, 35, admitted conspiracy to murder six of her children, including Tristan and Blake, and five counts of attempted murder.

The attempted murder charges relate to four of her children, including Tristan and Blake. Machin, 37, also admitted the same charges.
Judge Jeremy Richardson QC said that no words could ever reflect ‘the enormity of what you have both done’.
He added: ‘The crimes you have committed quite frankly speak for themselves. The murder of two children.
‘The attempted murder of four children and the over-arching conspiracy to murder those children.
‘I repeat, those crimes speak for themselves. I have little doubt that each of you will in due course be sentenced to several terms of life imprisonment.’
Judge Richardson said it was a ‘matter for the judge, where a whole life order is imposed.’
They will both be sentenced on November 12.
Barrass wore a black off-the-shoulder dress with pink flowers as she cried throughout the 20-minute hearing. She was separated from Machin, who showed no emotion, by three security guards

On August 8 around 300 motorbikes led a hearse with two Lamborghinis, when the two boys were remembered at Grenoside Crematorium.
Sarah Barrass and Brandon Machin both pleaded guilty to murder Friday, today, Sentencing is set to take place on November 12.
Investigators say the pair discussed and plotted the murders over six days
and ten days after first devising their plot, the pair killed Tristan and Blake Barrass
The two boys are remembered at the Grenoside Crematorium. with a cortege made up mostly of bikers who assembled for the service following an appeal for riders to come forward and support the family.
With some revving their engines in respect as they followed the hearse, which carried one large white coffin with the boys’ names on each side.Hundreds of mourners packed the chapel at the crematorium with many listening to the service outside in the sunshine.
Friends and family say the brothers were both fanatical about fast cars and motorbikes, so local owners were asked to be part of the procession.